Safe autonomous flare and landing during autorotation through wind shear

Nicholas Grande, Jacob Willem Langelaan

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


This paper presents a method to compute the set of steady state autorotation conditions from which safe flare to landing through can be performed. Equations of motion of a helicopter in autorotation through wind shear are presented; these equations are used to compute an optimal trajectory to landing from candidate initial states (distance and height above the touchdown point, horizontal speed, descent rate, rotor speed) to a designated touchdown point. The effect of wind shear on these optimal trajectories and on the set of safe initial conditions is examined for two rotorcraft: the Bell OH-58A and a small electric-powered helicopter. The feasibility of using waypoint following control for autorotation landing is examined for the electric-powered helicopter.

Original languageEnglish (US)
Pages (from-to)2065-2076
Number of pages12
JournalAnnual Forum Proceedings - AHS International
StatePublished - Sep 9 2013
Event69th American Helicopter Society International Annual Forum 2013 -
Duration: May 21 2013May 23 2013

All Science Journal Classification (ASJC) codes

  • General Engineering


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